How do I create new component?

Hi,
I’m thinking to create a new component to put in the Thumbnails.
However, whenever I create one (even the simplest) I have this error and cannot find a solution.

TS7016: Could not find a declaration file for module ‘./Test’. ‘/path/to/react/features/filmstrip/components/web/Test.js’ implicitly has an ‘any’ type.

Is there any guide on how create new component? If so, it would help a lot!

Write it in TypeScript.